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    Transfer case shifter handle

    In my 1980 GMC k3500 it has a 454 in it with the manual transmission, I remember when the 400 engine and the th400 transmission was in this truck the four-wheel drive shifter handle was really solid not hardly any play, but when my brother put in this 454 and the 205 transfer case the handle is...
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    Lubrication

    My 1980 GMC K3500 has a 454 with the standard 4-speed transmission, it came from the factory with the 400 engine and the th400 transmission, my question is what kind of lubricating fluid should be in the transfer case? When my brother put the four-speed transmission in I'm guessing he had to...
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    Ignition timing

    What should the timing on my 78 454 be? It's a slightly modified engine with an RV cam that's in my 1:10 dual four wheel drive with a 4-speed manual
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    Led headlight mod

    I have a 1980 GMC K3500 I want to upgrade the headlights to brighter lights, can I just change the bulbs to LED or do I want to change the entire assembly? Does anyone have experience with the headlight mod? Thank you in advance.
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    Aftermarket windshield wipers

    The factory windshield wipers on a 1980 GMC or 16 inches, that seems very small for that big window, will longer wipers work on this truck? Or maybe a combination of two different lengths like you see nowadays?
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    Steering dampener

    I'm looking to replace the steering dampener on my 1980 GMC k3500, it's basically stock from the factory, I'm running a 454 in it, what dampener do you guys recommend? Thanks in advance!
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    Valve adjustment

    When I adjusted the valves in my 78 454, the engine was running and hardly any oil was spraying out the driver side but when I went to do the passenger side there was a considerable amount of oil spraying out of there, why would there be such a difference between the two sides? I'm just curious...
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    Vacuum operated heater air conditioner controls

    This is on my 1980 GMC k 3500 truck, Look at the attached picture, this circular cup looking device on the air conditioner box, it has two vacuum lines to it, the bigger one described with the arrow connects to manifold vacuum then the smaller diameter line pointed out with an arrow goes inside...
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    Timing marks

    This is a picture of the ignition timing tab on my 1978 454 it's in my k35 1-ton dually, I am trying to identify the timing marks on this factory bracket but unfortunately the numbers are heavily worn, would anyone like to take a guess at which notch is zero top dead center and what the other...
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    454 valve adjustment

    I have this 1978 454 it does not have a lot of miles on this engine since it's been rebuilt but I hear light ticking and clacking coming from the right side, I haven't ran it yet since I pulled the valve covers off but I'm going to do that soon, are these rocker arms adjustable or are they the...
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    Turn signal cam

    The new turn signal module arrived today it's the pretty one on the right that clip on the harness is twice as long as the original one on the left, does anyone know if it will still plug into the chassis harness or do I got to do some finagling? The original plug is subbridled it broke while I...
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    Complete wire diagram

    I have a 1980 GMC k3500 Sierra classic camper special, I would like to find a complete wiring diagram to this truck, some of the ones I found look clear from a distance but when you zoom in they get all blurry, where can I find a decent wiring diagram?
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    Ignition cylinder

    My 1980 GMC K3500 is in need of the turn signal assembly in the steering wheel replace, but the ignition cylinder can be pulled out so I'm thinking of changing it, is it very hard changing the cylinder? Right now you don't need a key to start the truck if you wanted. It is not a tilt steering...
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    Turn signal assembly

    Before I get too involved is this plastic piece you see here replaceable or do I have to replace the entire turn signal unit with wiring harness? It goes into a 1980 GMC k35.
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    Death wobble

    I have a 1980 GMC one ton dually k30 is what it's called I guess, it has a standard 4-speed transmission with a 454 engine it developed a death wobble a while ago when my son had it, my son said he changed the stabilizer shock and that fixed it but only for a while and now it is back, the...
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    Front Windshield

    My 1980 GMC regular cab K30 needs a new windshield, what years will interchange?
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    What year 454

    I found these numbers and letters above the timing chain cover but I'm not sure how to read them, I'm trying to find out what year this 454 is if someone can help me figure this out that would be great!
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    454 year

    My 1980 GMC came with the 400 from the factory my brother installed the 454 out of one of his other trucks but I don't remember what year, how do I identify the year of this 454? Or how do I identify anything on this 454?
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    Dual tank switches and valves

    I am trying to get my fuel tank situated, I have dual tanks one was already replaced but I'm looking at this valve two-way valve, does anybody have a diagram of this valve and where the lines go? It's the valve that switches from one tank to the other
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    Two piece drive shaft bolts

    1980 GMC k 3500, Does anyone know what size bolts hold this two-piece driveshaft flange onto the output of the transfer case? It's the output that connects the drive shaft to the front differential
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    Two piece front drive shaft

    The drive shaft that came with my truck is about 3 in Long then it should be, it came with the automatic transmission from the factory, my brother put a standard transmission in and now the front two piece is too long, I've been looking for a replacement but I can't find one the exact length of...
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    Dual fuel tanks and valves

    My 1980 GMC 1 ton dually has dual fuel tanks on looking at the switch does anyone know which color wires or number goes to the left tank or the right tank? I'm trying to find information on how to troubleshoot the passenger side fuel tank has been replaced the driver's side has not been replaced...
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    Receiver hitches

    My 1980 GMC dually currently does not have a receiver hitch, there are several good used ones on Facebook market but I don't know what years will interchange with my truck, this may be a broad question but how do I find out what years 2 in receiver hitch will fit my 1980 GMC 1-ton dually?
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    Gear swap

    Someone wants to give me a set of 3.73 ring and pinion out of a 2002 GMC Sierra 2500 HD, would they possibly fit in my 1980 GMC 1 ton dually with a Dana 70 rear end? What other information would be needed?
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    Rear end

    I'm just curious as to what type of rear end my 1980 GMC 4x4 dually truck has, I haven't torn into it yet but soon I will to change the gears to a different ratio, it came from the factory with either 410 or 411, my brother changed the th400 automatic to a 3-speed standard, so the gearing isn't...

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